murdock



2 Sheets-Sheet 1.

(Model.)

H. B. MURDOCK.

INJEGTOR.

No. 440,184. Patented Nov. 11, 1890.

wa? fra/QJ? TH: Noam! Uns co., Fumo-umn., wAsmNaTau, n. c.

(Model.) 2 Sheets-Sheet 2.

H. B. MURDOOK. INJBGTOR.

110.440,184. Patented Nov. 11, 1890.

MiMmeys.

IIORACE B. MURDCCK, OF DETROIT, MICHIGAN, ASSIGNOR TO TI-IE AMERICAN INJECTOR COMPANY, OF SAME PLACE.

i N J E o T o R.

SPECIFICATION forming part of Letters Patent No. 440,184, dated November 11, '1890.

Application filed July 26, 1889. Serial No. 318,743. (Model.)

To all whom it may concern.'

Be it known that I, HORACE B. MURDOCK, a citizen of the United States, residing at Detroit, county of Vayne, State of Michigan, have invented a certain new and useful Improvement in Injectors; and I do declare the following to be af ull, clear, and exact description of the invention,such as will enable 0thers skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of thisA specification.

In the drawings, Figure 1 is a longitudinal central section of an injector embodying my invention. Figs. 2 and 3 are detail views, partly in section, of a portion of the device illustrating a modified construction.

My invention relates, first, to the combination, with the delivery-tube, of a valve located on the side thereof governing a large overflow-opening, whereby when the injector is started water is prevented from backing up to the top of the delivery-tube; second, in joining the upper ond of the delivery-tube directly with the exit end of 'the combiningtube, whereby the establishment of a iiow through the injector to the boiler is more quickly and readily accomplished; third, in the provision of a perforated diaphragm between the overiiow-chamber and the deliverychamber and an automatic valve adapted to close said perforations or openings, the construction being such that water passing through the delivery-tube into the deliverychambermay find exit through this diaphragm and out through the overflow-chamber until the current has become so well established as to close the said valve by pressure from beneath; fourth, in the provision of a petcock at the lower end of the injector, whereby it may be thoroughly emptiedA to prevent freezing when not in use, and whereby a reacting pressure that would otherwise eX- ist in the delivery-chamber may be relieved in starting the injector and so facilitate the establishment of the current to the boiler.

In carrying out my invention, A is the case of the injector.

B is the lifting or feed tube, to which water may be lifted if employed as a live-steam injector or fed by gravity if employed as an eX- haust-steam injector.

C is the steam-nozzle, made adjustable up and down in the case by a screw engagement therewith or in any other convenient way.

D is the combining-tube seated .in the diaphragm D.

E is the force-tube or` delivery-tube, fitted at e through the diaphragm F, and provided with a iiange c', which seats up beneath the diaphragm F, the whole being held in place by the plug G, which screws up against it from beneath, and by removing which the delivery-tube may be withdrawn from the case.

II is the delivery-chamber, which leads offv in the usual way through a check-valve (not shown) to the boiler. The plug Gis provided with orifices g, affording free communication with the delivery-chamber.

I is the overflow-chamber, and I the overow-valve which permits the overiiow water to escape through the exit I2.

The upper end of the delivery-tube E is fitted wit-hin an opening d in the combiningtube or its diaphragm D', there being sufficient space above the end of the deliverytube to accommodate the expansion and contraction of the tube without binding.

E is a valve attached to the side of the delivery-tube near its upper end and governing a large overfiow-ori1ice c2 in the side of the tube.

E2 is a lip which prevents the valve E from swinging out too far and so prevents it from catching in the case when the tube is being withdrawn.

c3 is the usual overow-orifice at the restricted throat of the delivery-tube.

e4 represents orifices which lead past the diaphragm F and communicate between the overfiow-chamber and the delivery-chamber.

e5 is an automatic check-valve adapted to close the said orifices, but which remains down and open by gravity when the injector is not in operation.

J is a petcock adapted to draw off dripwater at the bottom of the injector to prevent freezing when the injector is not in use. It may also be employed in starting the in-l jector to relieve any pressure which would IOO otherwise accumulate within the deliverychamber to retard the establishment ofy the current to the boiler.

K is a cap or plugcovering an orifice through which a suitable tool may be inserted to engage with notches la, whereby the steam-nozzle may be turned and so adjusted toward or from the combining-tube.

j represents a iin, which may be turned in around the stem of the petcock, as shown in Fig. 3, and so prevent the latter from becoming unscrewed and lost. j

The operation of this device is as follows: Steam enters through the steam-nozzle in the usual way into the chamber B, and entering with the water into the combining-tube D the water is forced down into the deliverytube. The resistance to the flow of the water causes it to overflow at c2, but as soon as accelerated past this point the valve E closes by suction. The escape continues at e3 until the flow is established and sufficiently accelerated past this point. In the meantime the water flowing from -the base oty the delivery-tube escapes upward through. the conduits e4, and with the other overflow -water iinds exit through-the overflow-valve. Soon, however, the iiow becomes so rapid down through'the mouth of the delivery-tube that the rush ofl waterback throughv the orificesv c4 lifts the' check-valve e5, thus closing the saidoriiices and compelling the water to seek its exit into the boiler. rlhis free escape from the ldelivery-chamber may, if desired, be aided by open-V ing the petcock until the water has become sufficiently accelerated through vthe deliverytube.

What I claim is-4 j l. The combination, in an injector, of a fixed delivery-tube extending frornthe delivery-chamber into the overiiow-chamber, conduits upon its exterior communicating from one chamber to the other, and an auto-l matic valve adapted to close the lower ends of said conduits,substantially as andforthe purposes-described.

2. In an injector, thecombination of its delivery-tube extended from the deliverychamber up through the dividingwall or flange into the overflow-chamber, conduits exterior to the tube communicating between the two chambers, a valve adapted to close the lower ends of the conduits, anda petcock communieating with said delivery-chamber, substantially as and for the purposes described.

In an injector, the combination, with its case, of a delivery-tube projecting from the delivery-chamber up into the overiow-chamber and adapted to close the opening between the two chambers, conduits exterior to the bore of the delivery-tube communicating from one chamber to the other, a valve adapted to close the lower ends of said conduits, and a perforated plug adapted to screw into the case from beneath and hold the delivery-tube in place, substantially'as described.

` et.y In an injector, a delivery-tube provided with an orifice eiat` one side of the same, and a swinging valve E', journaled to said tube and adapted to cover saidv orifice, substantially as and for` the purposes described.

5. The combination, with the delivery-tube provided with the opening c2 and hinged valveV E', of the lip E2, substantially as and for the purposes described.

6. The injector 'consisting' of case A, the combining-tube, a delivery-tube extending from the delivery-chamber up through the overflow-chamber into a cavity at the base of the combining-tube, and in connection therewith the valve E', orifices e4, valve e5, retaining-plug, and petcock, all substantially as described.

7. In an injector,the combination, with a petcock at the bottom thereof, of a iin j, turned `in toward its stem and adapted-to prevent the unscrewing and'loss of the-petcock, substantially as described.

Intestimony whereof l sign this specifica-- tion inthe presence of two witnesses.

HORACE B. MURDOCK. Witnesses:

W. H. CHAMBERLIN, L. A. DoELTz.- 

